package com.java.lang;

import java.util.Collection;
import java.util.Stack;

public class MathDemo {
	public static void main(String[] args) {

		System.out.println(Math.PI);
		System.out.println(Math.sin(Math.PI / 180));
		System.out.println(Math.rint(2.5));
		System.out.println(Math.round(12.1));
		System.out.println(Thread.currentThread().getName());
	}

}
